Reported by BBC World
Investigations have begun in several European countries in response to the cyber-attacks
A spate of cyber-attacks that hit supermarket chains across at least 10 European countries on Monday has prompted European Union officials to warn of a deliberate attempt to disrupt the food supply chain.
Supermarkets have reported problems in Belgium, Estonia, Finland, Ireland, Italy, Luxembourg, the Netherlands, Portugal, Germany and Sweden, and the significant increase in freezer temperatures has forced retailers to discard food.
More from the original report
Temperatures in chains across Europe reportedly rose as high as 50C (122F).
Supermarket chains said the temperatures of refrigerators and freezers in some of their shops soared as high as 50C
The European Union has raised concerns about the attacks, which come three weeks after a cyber-attack disrupted as many as 700 French grocery stores, causing food losses estimated at tens of millions of euros.
The security of refrigeration systems as well as other devices that can be monitored remotely has heightened concerns about government-backed hybrid attacks.
The EU's food and agriculture commissioner, Christophe Hansen, said the bloc was taking the incidents very seriously and warned of further disruption in the future.
Commission spokesman Thomas Regnier was careful not to attribute blame, but said: "These incidents of course show once again how cyber-attacks can disrupt essential services and affect citizens' daily lives."
"These are not isolated incidents and of course we have to be collectively resilient and prepared for such cyber incidents."
In Italy , Giorgia Meloni's government called a meeting with intelligence chiefs, but said the impact was "currently very limited" and most of the food distribution chain had up-to-date security systems able to fend off such attacks.
At least four Co-op supermarkets in Sicily and one business in Tuscany were affected, according to the national cybersecurity agency.
Meloni's office said those businesses affected were "mostly still equipped with obsolete security systems, with interfaces directly exposed to the internet and inadequate authentication mechanisms".
Belgian supermarkets were among those hardest-hit, with dozens of stores reporting refrigeration failures. Federal prosecutors have opened an investigation.
UK meat industry hit by cyber-attack which targeted European supermarket freezers
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